The Observation Deck

The US is at risk of losing its top-notch triple-A credit rating within a decade unless it takes radical action to curb soaring healthcare and social security spending, Moody's, the credit rating agency, said yesterday.

The warning over the future of the triple-A rating - granted to US government debt since it was first assessed in 1917 - reflects growing concerns over the country's ability to retain its financial and economic supremacy.

It could also put further pressure on candidates from both the Republican and Democratic parties to sharpen their focus on healthcare and pensions in the run-up to November's presidential election.